Re: Ultimate limits to computation
Seth Lloyd, Ultimate physical limits to computation: http://arxiv.org/abs/quant-ph/9908043 As an example, quantitative bounds are put to the computational power of an ‘ultimate laptop’ with a mass of one kilogram confined to a volume of one liter. ... The ultimate laptop performs 2mc^2 /π¯h = 5.4258 × 10^50 logical operations per second on ≈ 10^31 bits. Although its computational machinery is in fact in a highly specified physical state with zero entropy, while it performs a computation that uses all its resources of energy and memory space it appears to an outside observer to be in a thermal state at ≈ 10^9 degrees Kelvin. The ultimate laptop looks like a small piece of the Big Bang. Order yours today! - The Cryptography Mailing List Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com
Crypto'09 Rump session to be webcast
The first Crypto rump session took place in 1981 and was immediately heralded as the most important meeting in cryptography. Each subsequent Crypto rump session has reached a new level of historical significance, outstripped only by the Crypto rump sessions that followed it. The Crypto2009[1] Rump Session[2] will be broadcast live[3] starting at Tuesday, August 18th at 7:30pm to 11pm (PST/UTC-7)[4]. Download calendar event (ics)[5] [1] http://www.iacr.org/conferences/crypto2009/ [2] http://rump2009.cr.yp.to/ [3] http://qtss.id.ucsb.edu/crypto2009/rump.sdp [4] http://timeanddate.com/worldclock/fixedtime.html?month=8day=18year=2009hour=19min=30sec=0p1=137 [5] http://www.iacr.org/conferences/crypto2009/Crypto2009RumpSessionWe.ics - The Cryptography Mailing List Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com
Re: Seizing the Enigma
Speaking of seizing an Enigma, here's a picture of a handy one rotor version I got at Bletchley Park. The rotor flips over so there's two possible rotors and the determined cryptographer can use multiple rotors by making several passes manually over the data. http://www.taugh.com/enigma.jpeg You can order your own here: http://www.bletchleypark.org.uk/shop/view_product.rhtm/130864/238505/detail.html R's, John - The Cryptography Mailing List Unsubscribe by sending unsubscribe cryptography to majord...@metzdowd.com
